Goodwill and Other Intangible Assets - Goodwill and other intangible assets rollforward (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Goodwill
Goodwill, beginning of period	$ 1,213,630
Goodwill acquired during the period	13,946
Goodwill, foreign currency translation	1,496
Goodwill, end of period	1,229,072
Intangible assets with an indefinite life
Intangible assets with an indefinite life, beginning of period	682,859
Indefinite-lived intangible assets acquired during the period	8,000
Indefinite-lived intangible assets, foreign currency translation	1,701
Intangible assets with an indefinite life, end of period	692,560
Intangible assets with a definite life
Intangible assets with a definite life, beginning of period	313,777
Identified definite life intangible assets	6,000
Amortization	(5,588)
Identified definite life intangible assets, foreign currency translation	(2,224)
Intangible assets with a definite life, end of period	311,965
Total
Goodwill and other intangible assets, beginning of period	2,210,266
Additions	27,946
Amortization	(5,588)
Foreign currency translation	973
Goodwill and other intangible assets, end of period	$ 2,233,597